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Derivatives Instruments (Cash Flow Hedges Recorded in AOCI) (Details) - CAD ($) $ in Millions		12 Months Ended
	May 26, 2021	Dec. 31, 2023	Dec. 31, 2022
Cash Flow Hedges
Realized gain in interest expense, net		$ 2	$ 2
Total gains in net income		2	2
Total unrealized gain in AOCI - effective portion, net of tax		14	$ 16
Unrealized gains currently in AOCI to be reclassified into net income within the next twelve months		$ 2
Cash flow hedges | Treasury lock
Cash Flow Hedges
Derivative gain loss amortization period	10 years
Total unrealized gain in AOCI - effective portion, net of tax	$ 19

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- Definition

Derivative gain loss amortization period in number of years.

+ References

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- Definition

Amount, after tax, of accumulated gain (loss) on derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-11

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
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- Definition

The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4C
-Subparagraph (d)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C

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- Definition

The net gain (loss) during the reporting period due to ineffectiveness in interest rate cash flow hedges. Recognized in earnings.

+ References

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-SubTopic 10
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-Section 50
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